﴿ وَذَرُوا۟ ظَٰهِرَ ٱلْإِثْمِ وَبَاطِنَهُۥٓ ۚ إِنَّ ٱلَّذِينَ يَكْسِبُونَ ٱلْإِثْمَ سَيُجْزَوْنَ بِمَا كَانُوا۟ يَقْتَرِفُونَ ﴾

“But abstain from sinning, be it open or secret-for, behold, those who commit sins shall be requited for all that they have earned.”

(Forsake the outwardness of sin) the adultery of the outward (and the inwardness thereof) secret adultery, i.e. taking lovers in secret. (Lo! those who garner sin) those who commit adultery (will be awarded) a lashing in this world and punishment in the Hereafter because of (that which they have earned) i.e. committing adultery.